Hydraulic metal press



Feb. 18, 1969 vj H ET AL 3,427,846

HYDRAULIC METAL PRESS Sheet Filed May 16, 1966 F/lg. I

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WYQWW ATTORNEYS HYDRAULIC METAL PRESS Sheet Filed May 16, 1966 Fig. 2

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BY 7 JM/ ATTORNEYS United States Patent 3,427,846 HYDRAULIC METAL PRESS Endre Viltschek and Laszlo Gal, Budapest, Hungary, assignors to Technoimpex Magyar Gepipari Kulkereskedelmi Vallalat, Budapest, Hungary Filed May 16, 1966, Ser. No. 550,464 U.S. CI. 72-81 Claims Int. Cl. B21b 1/10; B21d 22/18 ABSTRACT OF THE DISCLOSURE Large dished ends of metal containers can be made very simply by spinning, by means of opposed rollers that move radially outwardly on opposite sides of a rotating blank The present invention relates to a forming machine for the production of bodies of revolution, for example the dished ends of metal containers from a centrally supported sheet or circular blank. Hydraulic machines equipped with press rollers are already known in which the work is cold pressed onto to a metal tool by a roller. This method is cheaper than hot pressing for small runs although cold pressing tools are very expensive if their dimensions are large.

In another earlier machine the central substantially radial portion of the blank must be premachined and only a small radiused edge is formed with a forming roller which can thus be of small dimensions.

It is among the objects of the present invention to provide means for forming the entire dished end of the container or the like in one operation without the provision of :a forming tool of large dimensions.

According to the invention there is provided a forming machine for the production of bodies of revolution from a centrally supprted sheet or circular blank, wherein the blank is trapped between a driven roller and a freely idling roller, each roller being mounted on a bridge member which two bridge members are jointly or separately tiltable about a common pivot, the roller which forms the concave side of the body of revolution being associated with copying means which control the radial position of this roller in relation to the pivot.

One embodiment of the invention will now be described by way of example with reference to the accompanying drawings, in which:

FIGURE 1 of the accompanying drawings represents a schematic part sectional front elevation of an embodiment of the invention, and

FIGURE 2 is the corresponding side elevation, partly in section.

Referring to the drawings, a circular blank 1, which is to be formed into the shape of a dished container end is mounted by means of a centrally pierced hole on a freely rotatable vertical pin 2. A roller 5 is mounted on a bottom slide 4 controlled by a master cam 3. The bottom slide 4 rests on a lower rocking bridge 6 which, together with an upper rocking bridge 7, is tiltable about two common pivot pins 8 of which one only is shown in FIGURE 1.

The upper bridge 7 carries a roller 10 which bears down on the blank 1 from above. The roller 10 is drivable at variable speed through worm gear 11 by a motor 12 likewise carried by the upper bridge 7. The upper bridge 7 is tiltable by two thrust cylinders 13 (of which one is shown in FIGURE 2) which can be extended at a controllable ICC rate. The cylinders 13 act one on each side of the upper bridge 7 and control the angle of tilt. of the bridge.

Common deflection of both bridges is assured by the presence of a pin 9 which is axially slidably held in a block 16 mounted for rotation with one of the pins 8. In the position illustrated in FIGURE 1, the two rocking bridges 6 and 7 are independently tiltable, but as soon as pin 9 is displaced to the right, the bridge 6 is rigidly connected to pivot pins 8. The upper bridge 7 is permanently mounted for rotation with the pins 8.

In FIGURE 1 the bottom bridge 6 is shown arrested by a pin 14.

The forming of the dished end proceeds from the centre outwards, the contour of the finished product being determined by the shape of the roller 5. The portion which has the larger radius is formed by the joint movement of the upper and lower rollers. The peripheral radiused portion is formed by stopping the radial movement of the lower roller 5 by disengaging the pin 14 and continuing to move the upper bridge so that the upper roller 10 presses the rim of the blank against the shaped lower roller 5. Prior to forming the peripheral portion, the roller 5 may be replaced by a roller having a specific desired contour, or a tire having the desired contour may be mounted on the roller 5. The movement of the lower bridge 6 is arrested at the appropriate instant by retracting the arresting pin 14 which is axially slidably guided in a ring 15. The ring 15 is adjustably rotatable about pin 8.

The two pins 9 and 14 are simultaneously actuated because these pins must be moved to the left for arresting the lower bridge (FIGURE 1) and moved to the right when the two bridges are to be tilted together.

Should the particular shape of the work call for the performance of several consecutive operational cycles, the master cam 3 may be provided with several cam edges for consective use and in such a case the arresting pin 14 is brought into engagement during the final operational cycle.

Compared with hitherto known machines and their principle of construction, a machine according to the invention oifers the following advantages:

Costly tools are not needed, because the previously required large sized forming tool is replaced by a roller controlled by a hydraulic copying device;

The press roller and the counter-roller are each mounted on a tiltable bridge so that the pressure applied by the press roller to the surface that is to be formed always acts substantially in the normal direction thereto; moreover, the common movement of the two roller heads-so long as this is required-4s very simple to perform;

The large substantially radial central portion and the small radiused peripheral portion can be formed by the common deflection of both bridges and the marginal portion by the continued tilting deflection of the upper bridge whilst the lower bridge is arrested.

What we claim is:

1. Apparatus for forming dished bodies from sheet metal blanks, comprising means mounting the blank for rotation about its axis, a press roller for bearing against the convex side of the blank, a first bridge member on which said press roller is mounted, means mounting said first bridge member for swinging movement about an axis transverse to the axis of the blank, a motor on said bridge member for driving said press roller, a freely rotatable counter roller bearing against the concave side of the blank and having a peripheral profile conforming to the profile to be formed on the periphery of the blank, a slide on which said counter roller is mounted for sliding movement in a direction perpendicular to the swinging axis of said first bridge member, a second bridge member, means mounting said second bridge member for swinging movement about the same axis as said first bridge member, means mounting said counter roller on said second bridge member, and a copying device for controlling the sliding of said slide.

2. Apparatus as claimed in claim 1, and a pivot pin secured to said first bridge member, said second bridge member being rotatable on said pivot pin, a slidable locking bolt for coupling said first and second bridge members together, and an arresting pin for rendering stationary said second bridge member.

3. Apparatus as claimed in claim 2, said locking bolt and arresting pin being jointly movable.

4. Apparatus for forming dished bodies from sheet metal blanks, comprising means for mounting a circular sheet metal blank for rotation about its axis, a press roller bearing on the convex side of the blank and a counter roller bearing on the concave side of the blank, means mounting said rollers for conjoint swinging movement radially of the axis of rotation of said blank about an axis transverse to the axis of the blank, means for arresting the swinging movement of said counter roller before the counter roller reaches the edge of the blank, and means for thereafter swinging said mounting means References Cited FOREIGN PATENTS 8/1926 Austria. 4/1962 Canada.

RICHARD J. HERBST, Primary Examiner.

B. J. MUSTAIKIS, Assistant Examiner.

US. Cl. X:R. 7285, 101 

